sease was eradicated.

Practically all the animals that react are affected with tuberculosis and
should be separated from the herd, not only in the interest of the public,
but in the interest of the owner of the herd. The best authorities admit,
after studying many thousands of tests, that there are few, if any,
mistakes made in condemning cattle which show a typical tuberculin
reaction. The errors are principally in the other direction--that is, some
tuberculous animals are not discovered by the tuberculin test, but as the
most dangerous of these may be picked out by ordinary clinical examination
this fault of tuberculin is not so serious as it at first sight appears.
This being the case, it should not be necessary to force the tuberculin
test upon owners. They should be anxious to adopt it in their own interests
and for the protection of their patrons. There is to-day no greater danger
to the cattle and hog industries than that which confronts them in the form
of tuberculosis, a disease already widespread and rapidly extending.
Furthermore, in view of the results revealed by numerous tests covering
vast numbers of animals, tuberculin must be considered as harmless for
healthy animals. It has also been clearly demonstrated that tuberculin
interferes in no way with the milking function in healthy cattle; neither
in the quantity of milk nor in butter-fat value has any variation been
detected. The conclusions of some of the best authorities on the subject of
its harmlessness to healthy animals are given below.

Nocard and Leclainche state:

Direct experiments and observations collected by thousands show that the
tuberculin injections have no unfavorable effect. With healthy animals
the system is indifferent to the inoculation; with tuberculous animals it
causes slight changes which are not at all serious.

Bang has written as follows on this question:

We will now consider the following question, a very important one, in the
application of tuberculin, viz: Can the reaction produce a worse
condition in tuberculous animals than before existed? Hess emphatically
states that it can, and on this account he earnestly warns against its
application. My attention has been directed to this question from the
beginning. In my first publication on tuberculin injection I reported two
cases in which acute miliary tuberculosis was proved in two high-grade
tuberculous cows several weeks after the tuberculin inje